Specifications: Rated working voltage:12-24V USB Output: DC 5V / 3.1A Working temperature:0~50C Charge identification:support Support play format:MP3 Storage battery display accuracy:error +/-1V Loaded current accuracy:+/-0.1A SNR:>60dB Distortion:<0.1% Frequency response:20Hz-15KHz Left and right channel separating degree:>60dB Bluetooth Version: V3.0+EDR Bluetooth sound process:with AD2P(Advanced Audio Distribution Profile)function Transmitdistanz: <10m Mikfonreichweite: 0.5~2m FM transmitting frequency: 87.5 - 108 MHz FM adjustment mode:Stereo digital PLL frequency-locked Dimension: 11x2.5x1.5cm Package Dimension:14x5x2.5cm Color: Black Material: ABS 1.Adjustable to any angles ,and fit to all types of Vehicles 2.Full frequency FM transmitter 3.Digital Display 4.Support 3.5mm Line audio input 5.With power off switch (USB direct connect) 6.Support U Disk Player 7.Supports MP3, WMA format music 8.Bluetooth handsfree, answer, hang up, reject, redial calls and other functions 9.Bluetooth stereo music play 10.Echo cancellation and noise suppression (CVC) technology during a call 11.Supports dual USB output voltage, the maximum output 5V / 2A 12.Automatic power-off memory function 13.DC voltage measurement 14.Power smart IC indenitifcation charge 15.USB bothway Blind-mating without sides